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jumping Tachometer ?? jumping Tachometer ??
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Kirkham Motorsports

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Old 08-27-2013, 11:22 AM
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Had the same issue with a Speed Hut tach. I needed to instal an inline noise reducer to protect the sending unit from stray current. If the Alternator repair does not fix the tach issue, call the gauge manufacturer. May be a known issue.
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Old 08-27-2013, 06:49 PM
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Okay since you have no humor ...these cars are so simple.

Powermaster's are excellent products, doubt anything was wrong with it. A bad bearing will make noise for a long time before it seizes. A loose belt won't ruin a bearing, a tight one would.

Why would you think a ground is the problem if it worked fine for a long time?

Where does your tach signal come from? Your MSD box? hmmm...
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